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Implement proposal 148: Make client stream end reasons uniform.

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This patch makes every RELAY_COMMAND_END cell that we send pass through one of two functions: connection_edge_end and relay_send_end_cell_from_edge.  Both of these functions check the circuit purpose, and change the reason to MISC if the circuit purpose means that it's for client use.

svn:r17612
This commit is contained in:
Nick Mathewson 2008-12-12 20:30:42 +00:00
parent 5fb2ab1e65
commit a4a481d81c
3 changed files with 64 additions and 37 deletions
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2
ChangeLog
View File

@ -24,6 +24,8 @@ Changes in version 0.2.1.9-alpha - 200?-??-??
Partial implementation of proposal 157.
- Start serving certificates by <identity digest, signing key digest>
pairs. Partial implementation of proposal 157.
- Clients now never report any stream end reason except 'MISC'.
Implements proposal 148.
o Minor features (controller):
- New CONSENSUS_ARRIVED event to note when a new consensus has

92
src/or/connection_edge.c
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@ -183,14 +183,37 @@ connection_edge_destroy(circid_t circ_id, edge_connection_t *conn)
return 0;
}
/** Send a relay end cell from stream <b>conn</b> down conn's circuit. Set
* the relay end cell's reason for closing as <b>reason</b>.
/** Send a raw end cell to the stream with ID <b>stream_id</b> out over the
* <b>circ</b> towards the hop identified with <b>cpath_layer</b>. If this
* is not a client connection, set the relay end cell's reason for closing
* as <b>reason</b> */
static int
relay_send_end_cell_from_edge(streamid_t stream_id, circuit_t *circ,
uint8_t reason, crypt_path_t *cpath_layer)
{
char payload[1];
if (CIRCUIT_PURPOSE_IS_CLIENT(circ->purpose)) {
/* Never send the server an informative reason code; it doesn't need to
* know why the client stream is failing. */
reason = END_STREAM_REASON_MISC;
}
payload[0] = (char) reason;
return relay_send_command_from_edge(stream_id, circ, RELAY_COMMAND_END,
payload, 1, cpath_layer);
}
/** Send a relay end cell from stream <b>conn</b> down conn's circuit, and
* remember that we've done so. If this is not a client connection, set the
* relay end cell's reason for closing as <b>reason</b>.
*
* Return -1 if this function has already been called on this conn,
* else return 0.
*/
int
connection_edge_end(edge_connection_t *conn, char reason)
connection_edge_end(edge_connection_t *conn, uint8_t reason)
{
char payload[RELAY_PAYLOAD_SIZE];
size_t payload_len=1;
@ -210,7 +233,15 @@ connection_edge_end(edge_connection_t *conn, char reason)
return 0;
}
payload[0] = reason;
circ = circuit_get_by_edge_conn(conn);
if (circ && CIRCUIT_PURPOSE_IS_CLIENT(circ->purpose)) {
/* If this is a client circuit, don't send the server an informative
* reason code; it doesn't need to know why the client stream is
* failing. */
reason = END_STREAM_REASON_MISC;
}
payload[0] = (char)reason;
if (reason == END_STREAM_REASON_EXITPOLICY &&
!connection_edge_is_rendezvous_stream(conn)) {
int addrlen;
@ -225,7 +256,6 @@ connection_edge_end(edge_connection_t *conn, char reason)
payload_len += 4+addrlen;
}
circ = circuit_get_by_edge_conn(conn);
if (circ && !circ->marked_for_close) {
log_debug(LD_EDGE,"Sending end on conn (fd %d).",conn->_base.s);
connection_edge_send_command(conn, RELAY_COMMAND_END,
@ -2455,7 +2485,6 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
relay_header_t rh;
char *address=NULL;
uint16_t port;
char end_payload[1];
or_circuit_t *or_circ = NULL;
assert_circuit_ok(circ);
@ -2473,9 +2502,8 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
circ->purpose != CIRCUIT_PURPOSE_S_REND_JOINED) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Relay begin cell at non-server. Closing.");
end_payload[0] = END_STREAM_REASON_EXITPOLICY;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_EXITPOLICY, NULL);
return 0;
}
@ -2483,26 +2511,23 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
if (!memchr(cell->payload+RELAY_HEADER_SIZE, 0, rh.length)) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Relay begin cell has no \\0. Closing.");
end_payload[0] = END_STREAM_REASON_TORPROTOCOL;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_TORPROTOCOL, NULL);
return 0;
}
if (parse_addr_port(LOG_PROTOCOL_WARN, cell->payload+RELAY_HEADER_SIZE,
&address,NULL,&port)<0) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Unable to parse addr:port in relay begin cell. Closing.");
end_payload[0] = END_STREAM_REASON_TORPROTOCOL;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_TORPROTOCOL, NULL);
return 0;
}
if (port==0) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Missing port in relay begin cell. Closing.");
end_payload[0] = END_STREAM_REASON_TORPROTOCOL;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_TORPROTOCOL, NULL);
tor_free(address);
return 0;
}
@ -2514,18 +2539,16 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
*/
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Attempt to open a stream on first hop of circuit. Closing.");
end_payload[0] = END_STREAM_REASON_TORPROTOCOL;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_TORPROTOCOL, NULL);
tor_free(address);
return 0;
}
} else if (rh.command == RELAY_COMMAND_BEGIN_DIR) {
if (!directory_permits_begindir_requests(get_options()) ||
circ->purpose != CIRCUIT_PURPOSE_OR) {
end_payload[0] = END_STREAM_REASON_NOTDIRECTORY;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_NOTDIRECTORY, NULL);
return 0;
}
if (or_circ && or_circ->p_conn && or_circ->p_conn->_base.address)
@ -2537,9 +2560,8 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
* need to set it to something nonzero. */
} else {
log_warn(LD_BUG, "Got an unexpected command %d", (int)rh.command);
end_payload[0] = END_STREAM_REASON_INTERNAL;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_INTERNAL, NULL);
return 0;
}
@ -2564,9 +2586,9 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
if (rend_service_set_connection_addr_port(n_stream, origin_circ) < 0) {
log_info(LD_REND,"Didn't find rendezvous service (port %d)",
n_stream->_base.port);
end_payload[0] = END_STREAM_REASON_EXITPOLICY;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, origin_circ->cpath->prev);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_EXITPOLICY,
origin_circ->cpath->prev);
connection_free(TO_CONN(n_stream));
tor_free(address);
return 0;
@ -2591,9 +2613,8 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
/* default to failed, change in dns_resolve if it turns out not to fail */
if (we_are_hibernating()) {
end_payload[0] = END_STREAM_REASON_HIBERNATING;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_HIBERNATING, NULL);
connection_free(TO_CONN(n_stream));
return 0;
}
@ -2617,9 +2638,8 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
connection_exit_connect(n_stream);
return 0;
case -1: /* resolve failed */
end_payload[0] = END_STREAM_REASON_RESOLVEFAILED;
relay_send_command_from_edge(rh.stream_id, circ, RELAY_COMMAND_END,
end_payload, 1, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_RESOLVEFAILED, NULL);
/* n_stream got freed. don't touch it. */
break;
case 0: /* resolve added to pending list */

7
src/or/or.h
View File

@ -457,6 +457,8 @@ typedef enum {
/** Client-side circuit purpose: at Alice, rendezvous established. */
#define CIRCUIT_PURPOSE_C_REND_JOINED 12
#define _CIRCUIT_PURPOSE_C_MAX 12
/** Hidden-service-side circuit purpose: at Bob, waiting for introductions. */
#define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO 13
/** Hidden-service-side circuit purpose: at Bob, successfully established
@ -478,6 +480,9 @@ typedef enum {
/** True iff the circuit purpose <b>p</b> is for a circuit that
* originated at this node. */
#define CIRCUIT_PURPOSE_IS_ORIGIN(p) ((p)>_CIRCUIT_PURPOSE_OR_MAX)
#define CIRCUIT_PURPOSE_IS_CLIENT(p) \
((p)> _CIRCUIT_PURPOSE_OR_MAX && \
(p)<=_CIRCUIT_PURPOSE_C_MAX)
#define CIRCUIT_IS_ORIGIN(c) (CIRCUIT_PURPOSE_IS_ORIGIN((c)->purpose))
/** How many circuits do we want simultaneously in-progress to handle
@ -2970,7 +2975,7 @@ int connection_edge_reached_eof(edge_connection_t *conn);
int connection_edge_process_inbuf(edge_connection_t *conn,
int package_partial);
int connection_edge_destroy(circid_t circ_id, edge_connection_t *conn);
int connection_edge_end(edge_connection_t *conn, char reason);
int connection_edge_end(edge_connection_t *conn, uint8_t reason);
int connection_edge_end_errno(edge_connection_t *conn);
int connection_edge_finished_flushing(edge_connection_t *conn);
int connection_edge_finished_connecting(edge_connection_t *conn);